#'' "" ''''''
#字符串
a = 'hello'
b = "world"
c = '''hello world'''
print('{0}----{1}-----{2}'.format(1,2,3))
str1=666
print(f"{str1}最牛马")
print(f"{c}最牛马")
# c.find('world') replace('world','python') split(' ') join(' ')
print(c.find('world'))
print(c.replace('l','w',3))
# print(c.replace('w','l',))
sep='.'
print(sep.join(c))
# strip() lstrip()头 rstrip()尾 upper() lowwer() capitalize() title() center() ljust() rjust()
print(c.title(),c.capitalize())